I have an NUnit project. In the [TestFictureSetUp] I set the ActualConnectionString.

When I run the tests, the ActualConnectionString is fine until it gets into the classes that use the generated code, then it becomes blank somewhere.

Is there anything special I need to do to a NUnit test to get the ActualConnectionString to not go blank? When the assembly is run in the WinForm app, they run fine.

Do you have the connection string defined in the right .config file? (unittests.dll.config) ?

Found it. Here the answer in case others have the same problem:

My NUnit test uses several assemblies, each with their own LLBL data layer project. I wasn't setting all the project's ActualConnectionString's to a value.